Design for a weighing scale



FIG. 1 is a top perspective view of a weighing scale showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a view thereof from the right of FIG. 2, the view thereof from the left of FIG. 2 being a mirror image thereof;

FIG. 4 is a view thereof from the top of FIG. 2;

FIG. 5 is a view thereof from the bottom of FIG. 2;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a view thereof similar to FIG. 1, but with a pan supported thereon. 

The ornamental design for a weighing scale, as shown and described. 